Die-cast Zinc Alloy
Die-casting alloys can be divided into two major alloy series for casting and machining.
Casting category includes die-casting zinc, aluminum alloy, gravity-casting zinc-aluminum alloy and die-casting zinc-copper-titanium creep resistant alloy, etc., used for die castings and various free castings such as bearings, wear-resistant parts, molds and shock-absorbing parts Wait.
Processing category includes superplastic zinc-aluminum alloy, deformable zinc-copper-titanium alloy, etc. It can produce semi-finished products such as belts, pipes, rods, wires, profiles and superplastic molded parts for construction, machinery, instrumentation, automobiles and electronics Industry and other sectors.
Die-cast zinc alloys require high corrosion resistance and excellent physical and mechanical processing properties, so the requirements for impurities are very strict, such as Pstrong <0.003%, Cd <0.002%, Sn <0 001%, must be used in alloying Zn> 99. 99% of the purest zinc. The alloy composition also requires high purity.
Die-cast zinc alloy refers to a series of zinc-based alloys containing 4% Al, 0.1% to 0.3% Cu. 0.03% to 0 1% Mg. This kind of alloy has the best fluidity near the eutectic point, but the creep rate is too high under high temperature and high pressure conditions. In order to further improve the physical properties of zinc-based alloys, casting machining performance, change alloy elements and their composition to form a new die-casting zinc alloy series.
China’s die-casting industry has developed into a new must-have industry, and zinc alloy die-castings have been rapidly developed as an important part of it. According to incomplete statistics from the China Foundry Association, from 1991 to 1998, the annual output of zinc alloy die castings in my country increased at a rate of 9.93%. In 1998, it was 84153t. The average annual increase in zinc consumption in the industry during the same period was 11.3%.
The production of zinc alloy die castings in China is concentrated in Guangdong, Fujian and East China. The “Australia No. 3” cast zinc alloy produced by Australia Pacific Metal Mining Co., Ltd. has been well received by Chinese users since it entered the Chinese market in the 1980s due to its stable product quality.
Gravity casting zinc alloy is a high-strength, high-toughness wear-resistant Taiwan gold, has excellent processing performance and casting performance, used to replace copper and copper alloy (bronze) as a bearing material, the cost is only 1/2 ~ 2/3 of bronze , Used as bearings, bushes, worm gears, etc. Two series of ILZKO and ZA are popular internationally. The alloy has aging problems.